Rock-drill machine



(No Model.)

A. N. TOWNSEND.

ROCK DRILL MACHINE.

No. 344,421. PatentedJune 29, 1886.

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WITNESSES IJV'VEJVTOR Nirnp STATES ATENT- Fries.

ASBURY N. TONVNSEND, OF LUCAS, IO\VA.

ROCK-DRILL MACHINE.

SPECIFICATION forming part of Letters Patent No. 344,421, dated June 29, 1886.

(No model.)

To aZZ whom it may concern:

Be it known that I, ASBURY N. Townsnni), of Lucas, in the county of Lucas and State of Iowa, have invented a new and useful Improvement in Miners Hand-Drills, which improvement is fully set forth in the following specification, reference being had to the accompanying drawings, which form part hereof, and in which Figure 1 is a plan of my improved drill. Fig. 2 is a vertical longitudinal section on the line A A, Fig. 1. Fig. 8 is a section of hinged nut attached to the bevel-wheel H. Fig. a is an end elevation of hinged nut attached to bevel-wheel, and Fig. 5 is an end view of feed-screw.

My invention relates to that class of drills known as miners hand-drills for boring coal; and it consists in certain improvements upon such hand-drills, as hereinafterspecified, it being the object of my invention to so construct a drilling-machine that a coarse thread can be used on the feed-screw to increase its durability.

My improved drill is represented in the accompanying drawings, and consists of a strong frame or housing, D, with the necessaryboxes and sleeve, 0, for carrying the crank-shaft F and feed-screw D, also hooks O G, to attach machine to posts when in operation. The feed-screw D is made in the ordinary nianner, and is provided with a keyseat, N, on one side or both. In this case it is 011 both sides and extending the whole length of screw, having a drill-socket, E, at one end, and secured by pin E, passing through it. Screw D passes freely through the bevel -wheel I, which has a sleeve proectin on one side and assin throu h hous a P a a ing 13, having feathers or pins 1, Figs. 1 and 2, to correspond and to work freely into key seats N I of screw D, Figs. 1 and 5. Pins 1 allow screw D to move lengthwise and give motion to screw through pinion J, Fig. 1, secured upon crank-shaft F, the speed of the rotary motion of screw regulated by the size of the bevel-wheels that drive it. Feedscrew D passes through a hinged nut, M, (shown in the several views,) made in this manner to facilitate the changing of different lengths of drills, as will readily be seen. lVhen the nut is open, the feed screw can be moved longitudinall y to accommodate the different lengths of drills, and when closed up and held by pin K clasping the screw, it is ready for operation. Nut M is provided with cars to be secured to bevel wheel H (so as to turn with bevel) at points L L L, allowing the hinged part of the nut K to be freely opened to re lieve the screw and closed to engage in the screw. Motion is transmitted to nut M by pinion G, placed upon crank-shaft F, engag ing into bevel H in proportion, say, about two revolutions of crank-shaft-F to one of bevel H.

It will also be seen that by the arrangement of a coarse thread on screw D (of, say, five threads to the inch) one revolution of crankshaft F will revolve bevel H and nut M one half-turn, which will feed screw one-tenth of an inch at every turn of crank shaft. The drills now in use are arranged so that every turn of screw feeds one-tenth of an inch, requiring ten threads to the inch instead of five, by which the durability of the machine is iucreased.

I am aware that mining-machines have here tofore been devised in which the threaded drill-rod is simultaneously rotated and fed forward by gear-connections with a single actuatingshaft, and hence I do not claim such construction, broadly.

My i nvention differs from all previous structures of its class in the superior simplicity and durability of the device, owing to the peculiar construction and arrangement of its parts.

Having thus described the nature and ob ject of my invention, what I claim therein as new, and desire to secure by Letters Patent, 1s

1. The combination, with the supporting frame constructed substantially as described, of the threaded drill-rod and the crank-shaft mounted at right angles to each other in said frame, the gear-wheels G and J, mounted rig- 5 idly upon the shaft at opposite sides of the drill-rod, the gear-wheel I, keyed to the drill rod and meshing with the gear. J, and the gear H, having the hinged feeding-nut K, and gearing with the gear G, substantially as set forth.

2. The combination, with the frame B, construeted as described, and having the sleeve 0 and hooks O, 01": the threaded drill-rod D and crank-shaft F, mounted at right angles to each other in said frame, the gear wheels G J mounted rigidly upon the crank-shaft and at opposite sides of the drill-rod, the gear I, having its sleeve keyed to the drill-rod and meshing with the gear J, and the gear H, having the hinged feeding-nut K, and meshing with the gear G, substantially as described.

7 ASBURY N. TOWNSEND.

Witnesses:

WILL KNEELAND, E. H. VVATKINs. 

